Organic compounds

ABSTRACT

THIS INVENTION RELATES TO NOVEL 7 A-METHYL-17A-ALKYNYLESTRADIOLS AND PROCESSES FOR THEIR PREPARATION; MORE PARTICULARLY TO THOSE COMPOUNDS EMBRACED BY THE FORMULA II   3-(R-O-),7-(CH3-),17-(R&#39;&#39;-C*C-),17-(R&#34;-O-)   ESTRA-1,3,5(10)-TRIENE   WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, THE ACYL RADICAL OF A HYDROCARBON CARBOXYLIC ACID CONTAINING FROM ONE THROUGH TWELVE CARBON ATOMS, AN ALKYL RADICAL CONTAINING FROM ONE THROUGH EIGHT CARBON ATOMS, TETRAHYDROFURANYL, TETRAHYDROPYRANYL, 5-SUBSTITUTED TETRAHYDROPYRANYL AND A SILYL RADICAL OF THE FORMULA   R1-SI(-R2)-R3   WHEREIN R1 R2 AND R3 ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL OF ONE THROUGH SIX CARBON ATOMS AND PHENYL, R&#39;&#39; IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL RADICAL CONTAINING FROM ONE THROUGH FOUR CARBON ATOMS AND R&#34; IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, THE ACYL RADICAL OF A HYDROCARBON CARBOXYLIC ACID CONTAINING FROM ONE THROUGH TWELVE CARBON ATOMS, AND A SILYL RADICAL OF THE FORMULA   R1-SI(-R2)-R3   WHEREIN R1, R2 AND R3 HAVE THE SAME MEANING AS ABOVE.

United States Patent 3,642,992 ORGANIC COMPOUNDS John C. Babcock and J Allan Campbell, Kalamazoo,

lR IIicIlr, assignors to The Upjohn Company, Kalamazoo,

No Drawing. Continuation-impart of application Ser. No. 114,621, June 5, 1961, which is a continuation-in-part of application Ser. No. 69,557, Nov. 6, 1960. This application Sept. 8, 1967, Ser. No. 666,465

Int. Cl. C07c 169/08 US. Cl. 424238 Claims ABSTRACT OF THE DISCLOSURE This invention relates to novel 7a-methyl-l7a-alkynylestradiols and processes for their preparation; more particularly to those compounds embraced by the Formula II 1 wherein R is selected from the group consisting of hydrogen, the acyl radical of a hydrocarbon carboxylic acid containing from one through twelve carbon atoms, an alkyl radical containing from one through eight carbon atoms, tetrahydrofuranyl, tetrahydropyranyl, S-substituted tetrahydropyranyl and a silyl radical of the formula carboxylic acid containing from one through twelve carbon atoms, and a silyl radical of the formula Rz-Si wherein R R and R have the same meaning as above.

CROSS REFERENCES TO RELATED APPLICATIONS This application is a continuation-in-part of application Ser. No. 114,621, filed June 5, 1961, now Pat. No. 3,341,557 which is in turn a continuation-in-part of abandoned application Ser. No. 69,557, filed Nov. '6, 1960.

BRIEF SUMMARY OF THE INVENTION The 7a-methyl-17a-al'kyny1estradiols of Formula II, above, can be prepared by the known methods described below.

(1) By treating 7a-methylestrone (I) (or its 3-ether) with an alkali metal derivative such as sodium acetylide, potassium acetylide, sodium or potassium methylacetylide, sodium or potassium ethylacetylide, sodium or potassium propylacetaylide, sodium butylacetylide, etc., in the presence of an inert solvent such as dioxane, dimethylice forrnamide or dimethylsulfoxide, to yield the corresponding 7a-methy1-17a-alkynylestradiol derivative (II).

(2) By heating 7a-methylestrone (I) (or its 3-ether) with an alkynylmagnesium halide (prepared by slowly passing a gas such as acetylene, methylacetylene, propylacetylene, butylacetylene, etc., through an ethereal solution of an alkylmagnesium halide such as methylmagnesium bromide) in the presence of a solvent such as tetrahydrofuran, ether, benzene, etc., to yield a corresponding 7u-methy1-l7u-alkynylestradiol derivative (11). Preferably, the Grignard reagent is employed in an excess of the order of 10 moles per mole of starting material (I).

The 3-acylates of the compounds of Formula II, above, are prepared by known methods for the esterification of 3-hydroxysteroids, for example by treating the appropriate 7a-methyl-17a-alkynylestradiol (II) wherein R is hydrogen with the desired hydrocarbon carboxylic acid anhydried in pyridine at from about 0 to 30 C. The 3,17-diacylates of the compounds of Formula H, above, are prepared by treating the appropriate 7a-methyl-17aalkynylestradiol wherein R and R" are both hydrogen with the desired hydrocarbon carboxylic anhydride in refluxing pyridine. When R is alkyl, the corresponding 7a-methyl 17oz (1-alkynyl)-estradiol 3-ether 17-acylate (II) is obtained.

The 17-esters of the compounds of Formula II, above, wherein R is alkyl, are also prepared by mixing together the appropriate 7a-methyl-l7walkynylestradiol (II) and an organic carboxylic acid in the presence of trifluoroacetic anhydride. The foregoing procedure when applied to compounds of Formula II wherein R is hydrogen, first yields the 3,17-diesters; mild alkaline hydrolysis of the thus produced compounds or chromatography through a column of alumina (Grade II) (basic) removes the 3- ester group and yields the 17-monoesters (II).

The 3-ethers of the compounds of Formula II, above, can be prepared from the compounds of Formula II wherein R is hydrogen by the known methods described below.

(1) By treating a 7a-methyl-17a-a1kynylestradiol of Formula (II) in accordance with the procedures disclosed in British Pat. 909,622, i.e., with an alkyl (or cycloalkyl) halide and an alkali metal alkylate, preferably at reflux temperature, to give a 3-alkyl (or cycloalkyl) ether of the 7a-methyl-:17a-alkynylestradiol (II).

(2) By treating a 7u-methyl-17u-alkynylestradiol (II) with an alkylating agent (e.g., a dialkylsulfate) in conventional manner, to give a 3-alkyl ether of the 70:- methyl-l7a-alkynylestradiol (II).

(3) By treating a 7u-methyl-17u-alkynylestra1diol (H) with a cyclic eno'l ether (e.g., dihydrofuran, dihydropyran, 5 hydroxymethyldihydropyran, 5 carboxydihydropyran, etc.) at low temperature, preferably in the presence of an acidic catalyst (e.g., phoshorus oXychloride), to give the corresponding 3-ether (e.g., tetrahydrofuranyl, tetrahydropyranyl, 5 -hydroxymethyltetrahydropyranyl, etc.) of the 7 rx-methyl-l7a-alkynylestradiol (II).

(4) By treating a 7u-methyl-17a-alkynylestradiol (II) with a diazoalkane (e.g., diazomethane, diazoethane, diazobutane, etc.) at ambient temperature in an inert solvent such as ether, ethylene glycol dimethyl ether, etc., to give the corresponding 3-alkyl ether of the 7u-methyl- 17a-alkynylestradiol (II).

(5) By treating a 7a-methyl-l7a-alkynylestradiol (II) with a disilazane of the formula NH wherein R R and R have the same meaning as above (e.g., hexamethyldisilazane, symmetrical diphenyltetramethyldisilazane, 1 methyl-1,l-dibutyl-3-phenyl-3,3- dimethyldisilazane, hexa-amyldisilazane, etc.) to yield a corresponding 3-silyl ether of the 7a-methyl-l7a-alkynylestradiol (II) and 3,17-bissilyl ether of the 70t-I1'16thyi-l7tlalkynylestradiol (II) which can be separated by conventional procedure.

The 7a-methylestrone (I) starting material of (1) and (2), above, can be prepared by several known methods described below.

(1) By fermentation of 7a-methyl-l9-nortestosterone (I) or 7a-methyl-19-nor-4-androstenc-3,17-dione with a microorganism or its enzymes capable of introducing a double bond in the 1(2)- or 1(2)- and 4(5)-positions of the steroid nucleus, e.g., Corynebacterium siinplex or Septomyxa ajfinis, to yield 7a-methylestrone (I).

(2) By catalytically dehydrogenating 7u-methyl-l9-nor- 4-androstene-3,17-dione at the 1(2)-position, e.g., by heating in the presence of a hydrogenation catalyst (e.g., palladium on charcoal) in a high boiling solvent (e.g., p-cymene), to give 7a-methylestrone (I).

(3) By treating 7a-methyl-19-nor-4-androstene-3,l7- dione with a chemical dehydrogenating agent, e.g., a quinone such as 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) or 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil), or selenium compounds such as selenium dioxide or dibenzoyloxy selenium oxide, to yield 7u-methylestrone (I).

(4) By pyrolysis of 7a-methyl-1,4-androstadiene-3,l7- dione at elevated temperatures (e.g., between about 400 to 600 C.) in high boiling diluents (e.g., heavy mineral oil) to give 7u-methylestrone (I).

(5) By treating 7a-methyl-l,4-androstadiene-3,l7-dione in accordance with the procedures described in J. Amer. Chem. Soc. 86, 742, i.e., with lithium and diphenyl in the presence of diphenylmethane and employing tetrahydrofuran as solvent, to yield 7a-methylestrone (I).

The 3-ethers of 7u-methylestrone (I) can be prepared by the known methods described above for the preparation of the 3-ethers of 7a-methyl-l7a-alkynylestradiol.

The 3-acylates of 7a-methylestrone (I) can be prepared by conventional procedures, e.g., by treating 7ot-methylestrone (I) with the appropriate organic carboxylic acid anhydride (or chloride) at moderate temperatures in the presence of an esterification catalyst such as pyridine, to yield the corresponding 7a-methylestrone 3-acylate (I).

All of the compounds included within Formulae I and II, above, can be isolated from their respective reaction mixtures by conventional means, for example, when a water-miscible solvent is used, by pouring the reaction mixture into water and separating the resulting precipitate by filtration or by extraction with water-immiscible solvents. Additional purification of the products can be accomplished by conventional means, for example, by elution chromatography from an adsorbent column with a suitable solvent such as acetone, methanol, dilute methanol, ethanol, ether, methylene chloride and Skellysolve B (hexanes), mixtures and combinations of these solvents; also by gradient elution chromatography from an adsorbent column with a suitable mixture of solvents, such as, methylene chloride-Skellysolve B, acetone-Skellysolve B, and the like.

The compounds of Formula II of the present invention are potent estrogens when administered either orally or parenterally; e.g., when assayed in rats by the Allen-Doisy test 7u-methyl-17a-ethynylestradiol 3-methyl ether (II) was found to have approximately twenty times the activity of estradiol. The compounds of Formula II when administered to mammals, birds and other animals, are also active in lowering cholesterol in the blood, inhibiting gonadotropin secretion, producing anabolic response, especially in providing nitrogen retention, and in supplying calcium lost as a result of osteoporosis. In addition, the compounds of Formula II, when combined with progestins such as 6ot-methyl-l7a-hydroxyprogesterone l7-acetate (Provera), 7a-methyl-l7a-ethynyl l9 nortestosterone, 17a-hydroxy-6-methyl-16-methylene 4,6 pregnadiene- 3,20-dione l7-acetate (Melengestrol acetate), 17-hydroxyl9-nor-l7a-pregn-(10)-en-20-yn-3-one (Norethynordrel) l9-nor-l7a-pregn 4 en 20 yne-3fl,17-dioldiacetate (Ethynodiol diacetate), l7-hydroxy-l9-nor-17a-pregn-4- en-20-yn-3-one (Norethindrone), the corresponding 17- acetate (Norethindrone acetate), 6a,2l-dimethyl-l7fl-hydroxy-4-pregnen-20-yn-3-one (Dimethisterone), 6-chloro- 17a-hydroxy-4,G-pregnadiene-3,20-dione 17-acetate, etc., are useful for the prevention of ovulation in mammals. The foregoing properties make the new compounds useful in veterinary practice.

The compounds of the invention can be prepared and administered to mammals, birds and animals, in a wide variety of oral or parenteral dosage forms, singly or in admixture with other coacting compounds. They can be administered with a pharmaceutical carrier which can be a solid material or a liquid in which the compound is dissolved, dispersed or suspended. The solid compositions can take the form of tablets, powders, capsules, pills, or the like, preferably in unit dosage forms for simple administration or precise dosages. The liquid compositions can take the form of solutions, emulsions, suspensions, syrups, or elixirs.

DETAILED DESCRIPTION It is to be understood that the invention is not to be limited to the exact details of operation or exact compositions shown and described herein, as obvious modifications and equivalents will be apparent to one skilled in the art, and the invention is therefore to be limited only by the scope of the appended claims.

Example 1.7u-methylestrone(7a-methyl-1,3,5 l0)- estratrien-3-ol-17-one) (I) To 10 l. of sterile glucose-yeast extract medium there was added an inoculum of 500 ml. of C rynebacterium simplex ATCC 6946. The culture was stirred and aerated for about 48 hours at a temperature of about 28 C., lard oil being added to suppress the foam. After about 48 hours the pH was 6.1. To the fermentor, 1 g. of 7amethyl-19-nortestosterone, prepared as in Steroids 1, 317, was added and aeration continued for about 24 hours. At this time the pH was 6.5. The beer was adjusted to pH 3 with hydrochloric acid and extracted four times with 3 l. of methylene chloride. Paper chromatography of an aliquot of the solvent extract indicated, by the Bush B-3 system, that essentially all of the 7u-methyl- 19-nortestosterone had been reacted and that two compounds showing the characteristics of aromatic A ring steroids were present. The less polar compound had the mobility of 7a-methylestrone (I) and the more polar that of 7u-methylestradiol. The methylene chloride extracts were evaporated to dryness and the residues obtained used for isolating the fermentation products. The crude residue was dissolved in methylene chloride and chromatographed through a gm. Florisil (synthetic magnesium silicate) column paoked wet with Skellysolve B (hexanes) and eluted with 400 ml. fractions by gradient elution between 5 l. of 4% acetone-Skellysolve B and 5 l. of 12% acetone-Skellysolve B. Fractions 4 through 7 gave well formed crystals. These fractions were combined and recrystallized from methanol with Darco (activated charcoal) treatment to give 0.45 g. of 7a-methylestrone (I), melting at 237 to 238 C.;

280 mg; e=2,l00.

Analysis.-Calcd. for C H O (percent): C, 80.21; H, 8.51. Found (percent): C, 80.10; H, 8.34.

7a-methylestradiol can be isolated from the more polar fractions.

Example 2.7ot-methylestrone (I) A sterile medium was prepared containing l. of tap water, g. of cornsteep liquors and 100 g. of commercial dextrose and adjusted to pH 5 with sodium hydroxide. This was inoculated with 500 ml. of a vegetative growth of Sepromyxa affinis (ATCC 6737) grown on the same medium. The culture was stirred and aerated at a rate of 0.1 l./minute. At the end of about 24 hours the pH was 7. To the fermentor, 2 g. of 7a-methyl-19- nortestosterone and 0.1 g. of 3-ketobisnor-4-cholen-22 al dissolved in 20 ml. of N,N-dimethylformamide was added. Aeration was continued for about 48 hours, the pH adjusted to 3 and the beer extracted four times with methylene chloride. Paper chromatography indicated the presence of 7a-methylestrone (I) in the extract.

' The product (I) can be isolated in accordance with the procedure described in Example 1 to give pure 70tmethylestrone (I).

Example 3.-7u-methy1estrone (I) A mixture of 100 mg. of 7ot-methyl-19-4-androstene- 3,17-dione, 40 mg. of 5% palladium on charcoal catalyst in 100 ml. of p-cymene (purified by passing through a column of alumina) was refluxed for about 1.5 hours. The catalyst was removed by filtration and the filtrate concentrated in a rotary evaporator. The residue was crystallized from ether to give mg. of 7a-methylestrone ('I), melting at 218 to 230 C.,

Hit;

279 m e:2,150. Infrared spectral analysis indicates it is the same compound as prepared in Examples 1 and 2. The product (I) can be further purified by recrystallization or chromatography to give pure 7a-methylestrone (I).

Example 4.7u-methylestrone (I) To a solution of 100 mg. of 7a-methyl-19-nor-4- androstene-3,17-dione, 100 mg. of 2,3dichloro-5,6-dicyanobenzoquinone (DDQ) and 0.5 ml. of acetic acid in 3 ml. of dioxane, 2 drops of 2.8 N hydrochloric acid solution in dioxane was added. After standing for about 16 hours, methylene chloride was added to the mixture and the DDQ filtered off. The filtrate was dried and the solvent removed. The residue, weighing about mg., was triturated with methanol to give about 1 mg. of 7a-methylestrone (I) with Milt.

280 III/L, 6:2,350. Infrared analysis indicated that the thus produced compound is the same as those prepared in Examples 1, 2 and 3.

Following the procedure of Example 4, but substituting selenium dioxide or tetrachloro p benzoquinone (chloranil) for DDQ, also yields 7ot-methylestrone (I).

Example 5.-7u-methylestrone (I) A pyrolysis tube (18" x 1") equipped with the thermocouples about 3 from each end and packed with glass tubing cut in about A lengths was heated to about 550 C. and heavy mineral oil passed through at a rate of 5 ml./minute until constant temperature of 500 to 510 C. at the top and 540 to 560 C. at the bottom was obtained. A mixture of 10.4 g. of 7a-methyl-1,4-andr0sta diene-3,17-dione and 500 ml. of heavy mineral oil mixed in a Waring blender was added at a rate of 5 rnl./minute, maintaining the above temperatures. The eflluent was refrigerated for several hours and the crystalline precipitate collected, washed thoroughly with Skellysolve B and dried to give 6.7 g. of crude 7ot-methylestrone (I). It was dissolved hot methylene chloride, cooled and poured on a 350 g. Florisil column packed wet with Skellysolve B and eluted with 400 m1. fractions by gradient elution between 5 l. of 4% acetone-Skellysolve B and 5 l. of 12% acetone-Skellysolve B. The desired product was contained in fractions 10 through 21. The residues obtained from 6 these fractions were combined and recrystallized from methanol to give 3.75 g. of 7ot-methylestrone (I), having a melting point of 230 to 235 C.; [ot] (chloroform);

alc. AIBEX.

279 m 6=2,250. Its nuclear magnetic resonance (NMR) spectrum confirms the proposed structure and infrared spectral analysis shows it is the same as the product obtained in Examples 1, 2, 3 and 4.

Example 6.7a-methylestrone (I) Treating 7a-methyl-1,4-androstadiene-3,17-dione in accordance with the procedures described in J. Amer. Chem. Soc. 86, 742, namely, with lithium and diphenyl in the presence of diphenyl methane and employing tetrahydrofuran as solvent, yields 7ot-methylestrone (1).

Example 7.--7a-methylestrone 3-cyclopenty1 ether (I) A mixture of 1 g. of 7a-methylestrone (I) and 1 g. of cyclopentyl bromide is added slowly to a solution of sodium ethylate (prepared from 0.1 g. of sodium and 8 ml. of absolute ethanol). The reaction mixture is heated to reflux for about 4 hours, the ethanol removed by distillation and the residue treated with a small amount of water, A precipitate of 7a-methylestrone 3-cyclopentyl ether (1) is obtained which is crystallized from a mixture of methylene chloride and methanol.

Example 8.7amethylestrone 3-methyl ether (I) To 4 g. of 7ot-methylestrone (I) in a solution containing 6.4 g. of potassium hydroxide, 14 m1. of water and 21 ml. of methanol, 14 ml. of dimethyl sulfate was added dropwise with stirring and cooling sufiicient to keep the reaction temperature at 25 to 35 C. At the same time a solution of 14 g. of potassium hydroxide in 28 ml. of water and 42 ml. of methanol was added dropwise at a rate that kept the pH of the reaction mixture about 10. The addition of the dimethylsulfate required about 30 minutes and the addition of the potassium hydroxide solution about 1 hour. The reaction mixture was stirred an additional 1.5 hours. Water was added and the' crystalline product collected on a filter, washed with water and dried to yield 3.8 g. of product (I) melting at to 163 C. It was recrystallized from methanol to give an analytical sample of 7ot-methylestrone 3-methyl ether (I) melting point 163 to 165;

ill-3..

Analysis.Calcd. for C H O (percent): C, 79.95; H, 9.39. Found (percent): C, 80.28; H, 9.48.

Following the procedure of Example 8 but substituting for dimethylsulfate the following:

(1) diethylsulfate,

(2) dipropylsulfate, (3) diisopropylsulfate, (4) dibutylsul-fate,

(5) di-s-butylsulfate, (6) dipentylsulfate, (7) dihexylsulfate,

(8) diheptylsulfate and (9) dioctylsulfate,

yields, respectively,

(1) 7ot-methylestrone 3-ethyl ether (I),

(2) 7ot-methylestrone 3-propyl ether (I),

( 3) 7ot-methylestrone 3-isopropyl ether (I), (4) 7a-methylestrone 3-butyl ether (I), (5) 7a-methylestrone 3-s-butyl ether (I), (6) 7a-methylestrone 3-pentyl ether (I),

7 (7) 7a-methylestrone 3-hexy1 ether (I), (8) 7u-methylestrone 3-heptyl ether (1) and (9) 7a-methylestrone 3-octyl ether (I).

Example 9.7u-methylestrone 3-tetrahydropyranyl ether (I) To a solution of 4 g. of 7ix-methylestrone (I) in 40 ml. of tetrahydrofuran (purified by percolation through a column of alumina) and 8 ml. of freshly distilled dihydropyran, 0.4 ml, of phosphorus oxychloride was added dropwise with stirring under nitrogen and cooling in an ice bath. After the addition was completed the ice bath was removed and after an additional 15 minutes the reaction mixture was poured into a mixture of saturated solution of sodium bicarbonate, ether and ice. The ether layer was separated, washed with dilute sodium bicarbonate solution, water, dried over sodium sulfate and filtered. The filtrate was evaporated to dryness to give 5.1 g. of 7a-methylestrone 3-tetrahydropyranyl ether (1).

Following the procedure of Example 9 but substituting for dihydropyran the following:

(1) dihydrofuran, (2) -hydroxymethyldihydropyran, (3) S-carboxydihydropyran, etc.,

yields, respectively,

(1) 7a-methylestrone 3-tetrahydrofuranyl ether (I),

(2) 7a-methylestrone 3-(5 hydroxymethyl)tetrahydropyranyl ether (1),

(3) 7a-methylestrone 3-(5 carboxy)tetrahydropyranyl ether (I), etc.

Example 10.7a-methylestrone 3-acetate (I) To 1 g. of 7a-methylestrone (I), 2 ml. of pyridine and 1 ml. of acetic anhydride is added. The reaction mixture is kept at room temperature for about three hours; water is then added to precipitate the product (I) and destroy the excess acetic anhydride. Recrystallization from acetone and Skellysolve B yields 7a-methylestrone 3-acetate (I).

Following the procedure of Example but substituting for acetic anhydride the following:

(1) benzoic acid anhydride, (2) propionic anhydride,

(3) butyryl chloride,

(4) i-valeryl chloride,

(5) decanoyl chloride,

(6) hexanoic anhydride,

(7) sec, octanoic anhydride 8) capric anhydride,

(9) undecyl anhydride,

(10) dodecanoyl chloride, etc.,

yields, respectively,

(1) 7a-methylestrone 3-benzoate (I),

(2) 7u-methylestrone 3-propionate (I), (3) 7a-methylestrone 3-butyrate (I),

(4) 7u-methylestrone 3-i-valerate (I),

(5) 7a-methylestrone 3-decanoate (I),

(6) 7u-methylestrone 3-hexanoate (I), (7) 7a-methylestrone 3-sec. octanoate (I),

(8) 7a-methylestrone 3-caproate (I), (9) 7a-methylestrone 3-undecanoate (I), (10) 7ot-methylestrone 3-dodecanoate (I), etc.

Example 11.7a.-methylestrone 3-trimethy1silyl ether (I) To a suspension of 4 g. of 7ot-methylestrone (I) in 10 ml. of dry acetone, 6.5 ml. of hexamethyldisilazane was added. The mixture was stirred for about four days and then evaporated to dryness. The residue was dissolved in a mixture of methylene chloride and Skellysolve B and chromatographed over a 250 g. column of Florisil. Gradient elution between 5 l. of Skellysolve B and 5 l. of 10% acetone-90% Skellysolve B yielded 2.5 g. of 7a-methylestrone-3-trimethylsily1 ether (I) having a melting point of 103 to 107 C.

Following the procedure of Example 11 but substituting other disilazanes for hexamethyldisilazine, such as symmetrical diphenyltetramethyldisilazane, hexaamyldisilazane, etc., yields respectively, 7a-methylestrone 3- phenyldimethylsilyl ether (I), 7rx-methylestrone 3-triamylsilyl ether (I), etc.

The reactions of Example 11 and the paragraph thereafter are preferably carried out with the addition of a few drops to 2 ml. of trimethylsilyl chloride.

In place of acetone in Example 11, other inert dry solvents, such as tetrahydrofuran, dioxane, methylene chloride and the like, can be utilized.

Example 12.7a-methyl-Not-ethynylestradiol (II) ;To about 30 ml. of liquid ammonia cooled in a Dry-Ice (solid carbon dioxide)acetone bath, 1 g. of potassium was added. Acetylene was added until the blue color disappeared, then 0.3 g. of 7a-methylestrone (I) in 8 ml. of dioxane was added. The resulting solution was refluxed for about /2 hour then most of the ammonia allowed to escape. Water was added, the solution neutralized with hydrochloric acid and extracted with ether. The extracts were' washed with dilute hydrochloric acid, water, dilute sodium bicarbonate, again with water, dried and the solvent removed. The residue resisted crystallization. It was combined with mg. of another run of the same crude product in methylene chloride and then chromatographed through a colum of Florisil. The fractions that crystallized on scratching from methylene chloride-water-Skellysolve B then from methylene chloride-Skellysolve B gave 0.28 g. of partially solvated 70c methyl Not-ethynylestradiol (II), melting at C. with bubbling. On drying at 100 C. under high vacuum the product changed to an amorphous solid with Following the procedure of Example 12 but substituting other starting materials for 7a-methylestrone (I), such as 7a-methylestrone 3-methyl ether (1), 7a-methylestroue 3- cyclopentyl ether (I), 7a-methylestrone 3-tetrahydropyranyl ether (I) etc., yields, respectively, 7oc-In6ihYl-l7ozethynylestradiol S-methyl ether (II), 7a-methyl-l7u.-ethynylestradiol 3-cyclopentyl ether (II), 7a-methyl-l7a-ethynylestradiol 3-tetrahydropyranyl ether (II), etc.

Alternatively, 7a-methylestrone (I) and its 3-ethers can be converted to the corresponding 7a-methyl-17a-ethynylestradiols (II) by reaction with lithium acetylide-ethylenediamine complex in such solvents as dimethylsulfoxide, dimethylformamide, tetrahydrofuran and other unreactive organic solvents. For example, by employing this procedure, 7a-methylestrone 3-tetrahydropyranyl ether (I) is converted to 7u-methyl-Not-ethynylestradiol 3-tetrahydropyranyl ether (II).

Substitution of methylacetylene (propyne), ethylacetylene (l-butyne), propylacetylene (l-pentyne), butylacetylene (l-hexyne), etc., in Example 12 and the procedures of the paragraphs thereafter yields the corresponding 7wmethyl 17a propynyl, butynyl, pentynyl, hexynyl, etc., derivatives (II).

Example 13.--7u methyl 17oz (1 propynyl)estradiol 3 methyl ether [70c methyl 17a(1 propynyl)estra- 1,3,5(10) triene 3,17 diol 3 methyl ether] (II) .Methylacetylene gas is slowly passed into 150 ml. of a 3 N ethereal solution of methylmagnesium bromide intermittently for about 96 hours, ether being added as needed to keep the volume of the solution between about and 200 ml. To the aforesaid Grignard mixture, 5 g. of 7u-methylestrone 3-methyl ether (I) in 300 ml. of purified tetrahydrofuran is added. The reaction mixture is distilled until the temperature reaches 50 to 55 C., then refluxed for about 20 hours. It is then poured into a mixture of ice and ammonium chloride solution and extracted yields, respectively,

( 1 7a-methyl- 17oc-( 1-butynyl)estradiol 3-methyl ether (II),

(2) 7u-methyl-17a-(1-pentynyl)estradiol 3-methyl ether (II),

(3) 7a-methyl-17a-(l-hexynyl)estradiol 3-methy1 ether (II), etc.

Following the procedure of Example 13 and the paragraph thereafter but substituting 7a-rnethylestrone (I), 7a-methylestrone 3-methyl ether (I), 7a-methylestrone 3- cyclopentyl ether (I) and 7a-methylestrone 3-tetrahydropyranyl ether (I) as starting material, yields the corresponding 7a-methyl-17a-(l-alkynyl)-estradiol derivative (II).

Example 14.-7a-methyl-17u-ethynylestradiol 3-methyl ether (II) Following the procedure of Example 8 but substituting 7amethyl-17a-ethynylestradiol for 7a-methylestrone as starting material yields 7a-methyl-17a-ethynylestradiol 3- methyl ether.

Following the procedure of Example 8 but substituting 7a-methyl-l7a-ethynylestradiol for 7a-methylestrone as starting material and substituting for dimethylsulfate the following:

(1) diethylsulfate,

(2) dipropylsulfate, (3) diisopropylsulfate, (4) dibutylsulfate,

(5) di-s-butylsulfate, (6) dipentylsulfate, (7) dihexylsulfate,

(8) diheptylsulfate and (9) dioctylsulfate yields, respectively,

(1) 7 a-methyl-17a-ethynylestradiol 3-ethyl ether (II),

(2) 7a-methyl-17ot-ethynylestradiol 3-propyl ether (11),

(3) 7a-methyl-l7a-ethynylestradiol 3-isopropyl ether (4) 7a-methyl-17a-ethynylestradiol 3-butyl ether (II),

(5) 7a-methyl-l7a-ethynylestradiol 3-s-butyl ether (II),

(6) 7a-methyl-17ot-ethynylestradiol 3-pentyl ether (II),

(7) 7a-methyl-l7u-ethynylestradiol 3-hexyl ether (II),

(8) 7u-methyl-l71x-ethynylestradiol 3-heptyl ether (II) and (9) 7a-methyl-17a-ethynylestradiol S-octyl ether (II).

Following the procedure of Example 8 and the following paragraph but substituting for 7a-methylestrone the following:

( l 7a-methyl-17a-( 1-propynyl)estradiol (II) (2) 7a-methyl-17a-(1-butynyl)estradiol (II) (3) 7u-rnethyl-17a-(1-pentynyl)estradiol (II) and (4) 7a-methyl-17a-(1-hexynyl)estradiol (II) yields the corresponding 70: methyl 17u-(l-alkynyl)- estradiol 3-ethers.

Example 15.7u-methyl-17a-ethynylestradiol 3-trirnethylsilyl ether (II) To a suspension of 4 g. of 7 a-methyl-l7a-ethynylestradi- 01 (II) in 10 ml. of dry acetone, 6.5 ml. of hexamethyldisilazane is added. The mixture is stirred for about four days and then evaporated to dryness. The residue is dissolved in a mixture of methylene chloride and Skellysolve B and chromatographed over a 200 g. column of Florisil. The product is eluted by gradient elution between Skellysolve B and 10% acetone in Skellysolve B to give rnethyl-17a-ethynylestradiol B-trimethylsilyl ether (II) eX- hibiting OH absorption in the infrared and 70t-Il'l6thy1-17Ctethynylestradiol 3,17-bistrimethylsilyl ether (II) and exhibiting no OH absorption in the infrared.

Following the procedure of Example 15 but substituting other disilazanes for hexamethyldisilazane, such as symmetrical diphenyltetramethyldisilazane, hexaamyldisilazane, etc., yields respectively, 7a-methyl-l7a-ethynylestradiol B-phenyldimethylsilyl ether (II), 7a-methyl-l7aethynylestradiol B-triamylsilyl ether (II), etc.

The reactions of Example 15 and the paragraph thereafter are preferably carried out with the addition of a few drops to 2 ml. of trimethylsilyl chloride.

In place of acetone in Example 15, other inert dry solvents, such as tetrahydrofuran, dioxane, methylene chloride and the like, can be utilized.

Following the procedure of Example 15 and the paragraph thereafter but substituting for 7a-rnethyl-17a-ethynylestradiol (II) the following:

( 1) 7 a-methyl-l 7w l-propynyl) estradiol (II),

(2) 7ot-methyl-17a-( 1-butynyl)estradiol (II),

( 3) 7a-methyl-17u- 1-pentynyl)estradiol (II) and 4) 7a-methyl-17u-(1-hexynyl)estradiol (II) yields the corresponding 70: methyl l7a-(l-alkynyl)- estradiol 3-silyl ethers (II).

Following the procedure of Example 15, some disilylation occurs, producing 7a-methyl-17a-ethynylestradiol 3,17-bis-trirnethylsilyl ether (H). Following the procedure of Example 15 but increasing the amount of hexamethyldisilazane from 6.5 ml. to 10 ml. and if desired increasing the reaction time results in the formation of mainly 7a-methyl-17u-ethynylestradiol 3,17-bistrimethylsilyl ether (II), which can be purified by chromatography as described above.

Following the above modified procedure of Example 15 using increased amounts of disilazanes but substituting other disilazanes for hexamethyldisilazane, such as symmetrical diphenyltetramethyldisilazane, hexaamyldisilazane, etc., yields, respectively, 7a-methyl-17a-ethynylestradiol 3,17 bisphenyldimethylsilyl ether (II), 7amethyl-17 a-ethynylestradiol 3,17-bistriamylsilyl ether (II), etc.

Example l6.7a-methyl-l7u-ethynylestradiol 3-acetate (II) To 1 g. of 7ot-methyl-17a-ethynylestradiol (II) 2 ml. of pyridine and 1 ml. of acetic anhydride is added. The reaction mixture is kept at room temperature for about three hours; water is then added to precipitate the product benzoic acid anhydride, propionic anhydride, i-butyryl chloride, valeryl chloride, decanoyl chloride, hexanoic anhydride, sec. octanoic anhydride,

1 1 (8) capric anhydride, (9) undecyl anhydride, (10) dodecanoyl chloride, etc.,

yields, respectively,

(1) 7-ot-methyl-Net-ethynylestradiol 3-benzoate (II), (2) 7a-methyl-Not-ethynylestradiol 3-propionate (II), (3) 7u-methyl-Not-ethynylestradiol 3-i-butyrate (II), (4) 7a-methyl-Not-ethynylestradiol 3-valerate (II), (5) 7u-methyl-Nix-ethynylestradiol 3-decanoate (II), (6) 7a-methyl-flat-ethynylestradiol 3-hexanoate (II), (7) 7a-methyl-17a-ethynylestradiol 3-sec. octanoate (II), (8) 7a-methyl-Not-ethynylestradiol 3caproate (II), (9) 7a-methyl-Not-ethynylestradiol 3-undecanoate (II), (10) 7a-methyl-Not-ethynylestradiol 3-dodecanoate (II),

etc.

Following the procedure of Example 16 and the paragraph thereafter but substituting for 7a-methyl-17a-ethynylestradiol (II) other starting materials, such as 7amethyl-17ot-(1-propynyl) estradiol (II), 7ot-rnethyl-17a- (l-pentynyl) estradiol (II), and 7ot-methyl-17a-(l-hex ynyl)estradiol (II) yields the corresponding 7a-methyl- 17a-(1-alkynyl)estradiol 3-acylate.

Example 17.7a-methyl-Not-ethynylestradiol 3,17- diphenylacetate (II) A mixture of 0.75 ml. of trifluoroacetic anhydride and 1.5 g. of phenylacetic acid was heated at about 70 C. for about 10 minutes, cooled in an ice bath and 600 mg. of 7a-methyl-17a-ethynylestradiol (II) added. The ice bath was removed and after about 2 hours water was added to the mixture. The crude product was extracted with ether, washed first with dilute sodium carbonate solution, then water, dried over magnesium sulfate and filtered. The solvent was removed leaving a residue of 7amethyl 170a ethynylestradiol 3,17-diphenylacetate (II). The product can be further purified if desired by chromatography over silica gel and by crystallization.

Following the procedure of Example 17 but substituting for phenylacetic acid other acids, such as acetic, propionic, butyric, isobutyric, valeric, decanoic, acrylic, benzoic, naphthoic, phenylpropionic, cyclopentylpropionic, cyclohexylcarboxylic, etc., yields the corresponding 3,17- diester of 7a-methyl-Not-ethynylestradiol (II).

Following the procedure of Example 17 and the paragraph thereafter but substituting for 7a-methyl-l7a-ethynylestradiol (II) other starting materials, such as 7amethyl-17w(1-propynyl)estradiol (II), 7oc-m6thyl-l7oc-(1- butynyl)estradiol (II), 7a-methyl-l7a-(1-pentynyl)estradiol (II), 7a-methyl-17a-(l-hexynyl)estradiol (11), yields the corresponding 7a-methyl-17a-(1-alkynyl)estradiol 3,- 17-diester (II).

Example 18.7a-methyl-Not-ethynylestradiol 17-phenylacetate (II) The 7u-methyl-l7a-ethynylestradiol 3,17-diphenylacetate (II) obtained in Example 17 was chromatographed through a column of alumina (Grade II) (neutral). The 3-ester group was removed and 7a-IIICIhYl-17u-6IhyI1Ylcstradiol l7-phenylacetate (II) obtained as a glassy foam;

279.5 m e=2,220. The NMR and infrared spectra support the molecular structure of the compound.

Following the procedure of Example 18 but substituting for 7a-methyl-Wot-ethynylestradiol 3,17-diphenylacetate (II) other 3,17-diesters of 7a-methyl-17a-ethynylestradiol, such as the 3,17-diacetate, 3,17-dipropionate, 3,17-dibutyrate, 3,17-divalerate, 3,17-dibenzoate, 3,17-dicyclopentylpropionate, etc., yields the corresponding 7amethyl-Not-ethynylestradiol 17-ester (II).

Following the procedure of Example 18 and the paragraph thereafter but substituting for 7a-methyl-17aethynylestradiol 3,17-diesters (II) other starting materials, such as a 7o -methyl-l7et-(l-propynyl)estradiol 3,17-di- 12 ester (II), 7u-methyl-17a-(1-butynyl)estradiol 3,17-diester (II), 7oz methyl-17a-(1-pentynyl)estradiol 3,17 diester (II), etc., yields the corresponding t-m8thyl-170t-(1- alkynyl)estradiol 17-ester (II).

An alternate procedure for the preparation of 7a-methyl- Hot-ethynylestradiol 17-phenylacetate is to use mild basic hydrolysis. To a solution of 2.5 g. of potassium carbonate in 25 ml. of water is added 225 ml. of methanol, followed by 5.0 g. of 7a-methyl-Not-ethynylestradiol 3,17-diphenylacetate (II). The mixture is stirred for about two hours at about 20 C. then is poured into 700 ml. of water with efiicient stirring, resulting in precipitation of 7u-methyl- Hot-ethynylestradiol l7-phenylacetate (II), which is then separated, e.g., by filtration, and dried. The product can be further purified by chromatography over Florisil or alumina as described above.

Following the alternate procedure of Example 18 given immediately above but substituting for 7a-methyl-l7aethynylestradiol 3,17-diphenylacetate (II) other 3,17-diesters of 7a-methyl-17ot-(l-alkynyl)estradiols yields the corresponding 7a-methyl 17a (l-alkynyl)estradiol l7- ester (II).

Example l9.7a-methyl-Hot-ethynylestradiol 17-phenylacetate 3-trimethylsilyl ether II) Following the procedure of Example 15, but substituting for 7a-methyl-Hot-ethynylestradiol a 7amethyl-l7a- (l-alkynyl)-estradiol 17-acylate, e.g., the following:

( l) 7a-methyl-Not-ethynylestradiol 17-phenylacetate (II),

(2) 7a-methyl-17a-(1-propynyl)estradiol l7-acetate (II),

(3) 7a-methyl-17a-(l-butynyl)estradiol 17-benzoate (II),

(4) 70 methyl 17u-(1-pentynyl)estradiol 17-propionate (5) 7a-methyl-17a-(1-hexynyl)estradiol l7-acetate (11) etc.,

yields, respectively,

(1) 7ot-methyl-Hot-ethynylestradiol 3-trimethylsilyl ether 17-phenylacetate (II),

(2) 7a-methyl-17a-(1-propynyl)estradiol S-trimethylsilyl ether 17-acetate (II),

(3) 7a-methyl-17ot-(1-butynyl)estradio1 3 -trimethylsilyl ether 17-benzoate (II),

(4) 7u-methyl-17a(1-pentynyl)estradiol 3 trimethylsilyl ether 17-propionate (II),

(5 7a-methyl-17a-(l-hexynyl)estradiol 3 trimethylsilyl ether l7-acetate (11), etc.

Further substituting other disilazanes for hexamethylsilazane, e.g. symmetrical diphenyltetramethyldisilazane, hexaamyldisilazane, etc., yields the corresponding 70:- methyl-17a-(1-alkynyl)estradiol 3-silyl ether 17-acylate (II).

Example 20.-7ot-methyl-Hot-ethynylestradiol 17-phenylacetate 3-methyl ether (II) A mixture of 0.75 ml. of trifluoroacetic anhydride and 1.5 g. of phenylacetic acid is heated at about 70 C. for about 10 minutes, cooled in an ice bath and 600 mg. of 7a-methyl-Not-ethynylestradiol 3-methyl ether (II) added. The ice bath is removed and after about 2 hours water is added to the mixture. The crude product is extracted with ether, washed first with dilute sodium carbonate solution, then water, dried over magnesium sulfate and filtered. The solvent is removed, the residue dissolved in acetone and Skellysolve B and chromatographed through a column of Florisil to give 7a-methyl-Hot-ethynylestradiol 17-phenylacetate 3-methyl ether (II).

Following the procedure of Example 20 but substituting 7a-methyl-Nix-ethynylestradiol 3-cyclopentyl ether (II) for 7OL-mCthyI-l7tZ-CIhYIlY1CSII'2dIOI 3-methyl ether (=II), yields 7a-methyl 17:1 ethynylestradiol 17-phenylacetate 3-cyclopentyl ether (II).

Following the procedure of Example 20 and the paragraph thereafter but substituting for phenylacetic acid other acids, such as acetic, propionic, isovaleric, acrylic, benzoic, cyclopentylpropionic, etc., yields the correspond- 13 ing l7-ester of 7a-methyl-Not-ethynylestradiol 3-methyl ether (II) or its 3-cyclopentyl ether (II).

Following the procedure of Example 20 and the two paragraphs thereafter but substituting for 7-u-methyl-l7aethynylestradiol 3-methyl ether (II) or its 3-cyclopentyl ether (1 1), other starting materials such as the 3-methyl ethers or 3-cyclopentyl ethers of 7a-methyl-l7a-(1-propynyl)estradiol (LII), 7a-methyl-l7a-(1butynyl)estradiol (II), 7a-methyl-17a-(l-hexynyl)estradiol (.11), etc., yields, respectively, the corresponding S-methyl ethers or 3-cyclopentyl ethers of 7a-methyl-17a-(l-propynyDestradiol l7- acylate (II), 7a-methyl-17a-(l-butynyl)estradiol 17-acylate (II), 7a-methyl-17a-(l-hexynyl)estradiol 17-acylate (*II), etc.

Example 21.-7m-methyl-Hot-ethynylestradiol 3-cyclopentyl eth'er 17-trimethylsilyl ether (11) Following the procedure of Example 15 but substituting for 7m-methyl-Net-ethynylestradiol (I I), 7a-methyl-l7uethynylestradiol 3-cyclopentyl ether (II) there is produced 7u-methyl-Hot-ethynylestradiol 3-cyclopentylether l7-trimethylsilyl ether (II). Substituting other 3-alkyl or cycloalkylethers or B-tetrahydropyranyl ethers and the like of 7a-rnethyl-17-ethynylestradiol (II) in the procedure of Example 21 gives the corresponding l7-trimethylsily1 ethers (II).

Further, substituting other disilazanes for hexamethyldisilazane affords the corresponding 7a-methylestradiol 3-ether 17-silyl ether (II).

Example 22.7a-methyl 17a ethynylestradiol B-acetate 17-phenylacetate (II) Following the procedure of Example 1 6 but substituting 7u-methy1-17a-ethynylestradiol 17-phenylacetate (II) for 7 a-methyl-Not-ethynylestradiol (II) as starting material yields 7a-methyl-l7a-ethynylestradiol 3-aceate 17-phenylacetate (II).

Following the procedure of Example 22 but substituting other starting materials such as (1) 7a-methyl-Nix-ethynylestradiol 17-propionate (II) (2) 7a methyl 17a (l-propynyl)estradiol 17-benzoate (3) 7a-methyl-17a-(l-butynyl)estradiol 17-valerate (II), (4% 7):! methyl 17a (1 pentynyl)estradiol 17-butyrate II (5 7 a-methyl-17al-hexynyl) estradiol 17 cyclopentylpropionate ('11), etc.,

yields, respectively,

(1) 7a-methyl 17oz ethynylestradiol 3-acetate l7-propionate (II).

(2) 7a-methyl 17a (1-propynyl)estradiol 3-acetate l7- benzoate (H),

(3) 7a-methyl-17a-(l-butynyl)estradiol B-acetate l7-valerate (II),

(4) 7u-methyl 17a (1-pentynyl)estradiol 3-acetate 17- butyrate (II),

(5) 7a-methyl- 17a (l-hexynyl)estradiol S-acetate 17- cyclopentylpropionate (11), etc.

Substituting other acylating agents for acetic anhydride, e.g., propionic anhydride and benzoyl chloride yields the corresponding S-acylates, e.g., 7u-methyl-l7u- (1-propynyl)estradiol 3-propionate 17 benzoate (II) and 7u-methyl-17tx-(l-hexynyl)-estradiol 3-benzoate 17acyclopentylpropionate (II), etc.

As indicated above, the compounds of this invention are useful for their estrogenic activity. Administration in mammals depends on the particular compound involved, route of administration, severity of the condition being treated and the individuals response thereto. In general, a dose of between about 0.01 mg. to about 5 mgs. of each of the compounds exemplified in Examples 12 through 22 and embraced within Formula 11 is given orally once a day, or subcutaneously or intramuscularly in a dose of 0.05 to 10 mg. weekly to monthly, in the treatment of conditions incident to the foregoing activity when incorporated in conventional pharmaceutical compositions.

The following examples illustrate the incorporation of the active ingredients of this invention in pharmaceutical formulation for use as estrogenics.

Example 23.-Compressed tablets A lot of 10,000 compressed tablets, each containing 0.05 mg. of 7a-methyl-Hot-ethynylestradiol or 7a-methyl- 17a-(1-propynyl)-estradiol 3 methyl ether is prepared from the following ingredients:

7a-methyl 17a ethynylestradiol or 70: methyl- 17a-(l-propynyl)estradiol 3-methyl ether 0.5 Dicalcium phosphate 2500 Methylcellulose, USP (15 cps.) 65 Talc, bolted 450 Calcium stearate, fine powder 35 The 7a-methyl-Not-ethynylestradiol or 7a-methyl-17a- (1-propynyl)estradiol Z-methyl ether and dicalcium phosphate are mixed well, granulated with 7.5% solution of methylcellulose in water, passed through a No. 8 screen and dried at F. The dried granules are passed through a No. 12 screen, mixed thoroughly with the talc and stearate and compressed into tablets.

Example 24.Hard gelatin capsules A lot of 1,000 hard gelating capsules, each containing 0.5 mg. of 7u-methy-l-flat-ethynylestradiol or 70:- methyl-17u-(1-propynyl)estradiol 3-rnethyl ether is prepared from the following ingredients:

7a methyl-Not-ethynylestradiol or 7a-methyl-l7a- (l-propynyl)estradiol S-methyl ether 0.5 Lactose Calcium stearate 2 Talc 3 The lactose, talc and stearate are mixed well and incorporated into the mixture. The whole is mixed well and filled into two-piece hard gelating capsules.

Example 25.Soft gelatin in capsules A batch of 1,000 soft gelatin capsules, each containing 0.5 mg. of 7a-methyl-Hot-ethynylestradiol or 70L- methyl-l7a (1-propynyl)-estradiol 3-methyl ether and corn oil is prepared from the following materials:

7a-methyl-17aethynylestradiol or 70: methyl 17a-(1- propynyl)estradiol 3-methy1ether0.5 gm. Corn oil--q.s.

A uniform dispersion of the active ingredient in the corn oil is prepared and the dispersion filled into soft gelatin capsules by conventional means.

Example 26.Aqueous oral suspension An aqueous oral suspension containing in each 5 ml. 0.5 mg. of 7a-methyl-Hot-ethynylestradiol or 7a-methyl- 17a (1-propynyl)-estradiol 3-methy1 ether is prepared from the following materials:

Example 27.Aqueous suspension for injection A suspending vehicle is prepared from the following materials:

Polyethylene glycol 40030 gm. Potassium chloride11.2 gm. Polysorbate 802 gm. Methylparaben1.8 gm. Propylparaben0.2 gm.

Water for injection q.s.-4000 ml.

The parabens are added to a major portion of the water and are dissolved therein by stirring and heating to 65 C. The resulting solution is cooled to room temperature and the remainder of the ingredients are added and dissolved. The balance of the water to make up the required volume is then added and the solution sterilized by filtration. The sterile vehicle thus prepared is then mixed with 0.5 g. of 7a-methyl-Hot-ethynylestradiol or 7a-methyl-17a (1 propynyl)estradiol 3-methyl ether which has been previously reduced to a particle size less than about 10 microns and sterilized with ethylene oxide gas. The mixture is passed through a sterilized colloid mill and filled under aseptic conditions into sterile containers which are then sealed.

Each milliliter of this suspension contains 0.5 mg. 70cmethyl 17oz ethynylestradiol or 70: methyl 170t-(1- propyny1)estradiol 3-methyl ether.

As indicated above, the compounds of this invention, in addition to their use as estrogenics, when combined with with progestins, e.g., 6u-methyl-l7a-hydroxyprogesterone progestins, e.g. 6u-methyl-l7a-hydroxyprogesterone l7- acetate (Provera), 7oz methyl-l7a-ethynyl-19-nortestosterone, 17a hydroxy-6-methyl-16-methylene-4,6-pregnadiene-3,20-dione l7-acetate (Melengestrol acetate), etc., are useful for the prevention of ovulation in mammals. Administration to mammals depends on the particular progestin and estrogen involved and the individuals response thereto. In general, a dose of between about 0.01 mg. to about 5 mgs. of each of the estrogens exemplified in Examples 12 through 22 and embraced within Formula 11 plus between about 1 mg. to about 100 mgs. of a progestin is given at such time(s) in the mammalian ovulatory cycle as is suitable for the prevention of ovulation.

The following examples illustrate the incorporation of the active ingredients of this invention with progestins in pharmaceutical formulation for use as anovulatories.

Example 28.Oral tablets 50,000 tablets for oral administration are prepared from the following types and amounts of materials. Each tablet contains 3.0 mgs. of 6a methyl-17a-hydroxyprogesterone l7-acetate and 0.03 mg. of 7a-methyl-l7a-ethynylestradiol or 7oz-lI16thyl-l7a-( 1propynyl)estradiol 3-methyl ether.

6u-methyl-l7a-hydroxyprogesterone 17-acetate5 oz.

7ot-methyl-l7u-ethynylestradiol or 7a-methyl-17al-propynyl)estradiol 3-methyl ether23 grains Lactose3 lbs.

The finely powdered active ingredients and lactose are mixed well and granulated with syrup-starch paste. Starch and calcium stearate are used as lubricants in the compressing step.

Example 29.-Oral tablets 10,000 tablets for oral administration are prepared from the following types and amounts of ingredients. Each tablet contains 10 mgs. of 6wmethyl-l7a-hydroxyprogesterone l7-acetate and 0.05 mg. of 7a-methyl-l7tx-ethynylestradiol or 70c-l1'ltl1y1-l7OL-( l-propynyl)estradiol 3-methyl ether.

Gms. 6a-methyl-l7a-hydroxyprogesterone 17-acetate 7a-methyl-l7a-ethynylestrone or 7rx-l'll8thYl-17a-(1- propynyl)estrone 3-methyl ether 0.5 Lactose 2600 The finely powdered active ingredients and lactose are mixed well and granulated with syrup-starch paste. Starch, talc, and calcium stearate are used as lubricants in the compressing step.

Example 30.-Oral aqueous suspension An aqueous suspension for oral administration, containing in each teaspoonful (approximately 5 ml.) 5 mg. of 6a-methyl-l7a-hydroxyprogesterone 17-acetate and 0.2 mg. of 7a-methyl-Nix-ethynylestradiol or 7a-methyl-17a- (l-propynyl)estradiol 3-methyl ether is prepared from the following types and amounts of ingredients:

6u-methyl-l7a-hydroxyprogesterone 17-acetate-1 gm.

7a-methyl 17cc ethynylestradiol or 7oz methyl 17a- (1-propynyl)estradiol 3 methyl ether40 mgms.

Preservative--2 grns.

Flavor, q.s.

Purified water U.S.P., a.s. ad 1000 mls.

The preservative and flavor are dissolved in the water. The micronized active ingredients are added and the whole is homogenized.

Example 31.Oral gelatin capsules 1,000 gelatin capsules for oral administration, each containing 10 mgs. of oat-methyl-l7a-hydroxyprogestrone l7-acetate and 0.05 mg. of 7ot-methyl-flat-ethynylestradiol or 7ot-methyl-l7a-(l-propynyl)-estradiol 3-methyl ether are prepared from the following types and amounts of materials:

6ot-methyl-17a-hydroxyprogesterone l7-acetate-l0 grns.

7a-methyl-flat-ethynylestradiol or 7u-methyl-17a-(1-propynyl)estradiol 3-methyl ether50 mgms.

Ingestible oil, q.s.

The micronized active ingredients and the oil are mixed and the mix is encapsulated by the usual techniques into gelatin capsules.

Example 32.-Oral tablets Following the rocedure of Example 28, 5,000 tablets are prepared from the following types and amounts of ingredients. Each tablet:

5 mgs. 6a-methyl-17a-hydroxyprogesterone 17- acetate25 grns.

0.01 mg. 7ot-methyl 17a ethynylestradiol or 7a-methyll7a-(l-propynyl)estradiol 3-methyl ether-50 mgsmgs. lactose750 gms.

3 mgs. acacial5 grns.

65 mgs. starch, bolted-325 grns.

3 mgs. calcium stearate-lS gms.

17 18 etc., can be employed instead of 6a-methyl-17a-hydroxy- 3. A composition in accordance with claim 2 wherein progesterone 17-acetate. the progestin is 7a-methyl-17a-ethynyl-19-n0rtestosterone.

We claim: 4. A method of preventing ovulation in ovulating mam- 1. 7a-methyl-17a-ethynylestradiol 3 17-bistrimethylsilyl mals comprising: orally administering to mammals an ether having the formula 5 elfective amount of (a) a compound of the formula CH3 O-SiCH OR" CECR I I no --CH3 wherein R is selected from the group consisting of hydrogen and methyl, R' is hydrogen and R" is hydrogen, and

(b) a progestin.

5. A method of preventing ovulation in mammals in 2. An oral pharmaceutical composition comprising: (a) about 0.01 to about 5 mg. of a compound of the formula accordance with claim 11 wherein the progestin is 7amethyl-17a-ethynyl-19-nortestoster0ne. OR" Cm References Cited I UNITED STATES PATENTS 3,318,928 5/1967 Anner et a1 260397.5 3,342,682 9/1967 Ercoli 260397.4

R0 "CH; FOREIGN PATENTS 1,434,174 2/1966 France 260-3975 wherein R is selected from the group consist- ELBERT ROBERTS Pnmary Examiner ing of hydrogen, and methyl, R is hydrogen and ER" is hydrogen, and US. Cl. X.R.

(b) about 1 to about mg. of a progestin, dis- 260-23955, 397.4, 397.5; -51

persed in an oral pharmaceutical carrier. t0 1 I should appear as shown below instead of as in the patent:

1520C; UNITED STATES PATENT OFFICE CERTIFFCATE OF CDRRECTIUN Patent No. 5,642,992 Dated February 15, 1972 Inventor) John C Babcock et al It is certified that error appears in the above-identified patent and that said- Letters Patent are hereby corrected as shown below:

Column 1, 'l ine 56, for "R read R Column 2,

R NSl R -Sl R R l ine l9, for "anhydried" read anhydr i de Column 14, l ine 46), for

"gelatin in capsules" read gelatin capsules Column 15, line 5, for "400' read i000 Column 17, lines 11 and 15,

CH3 O--Si H 3 v GEE. I c- :cH

cH CH -Si CH3 Column 17, l ine 59, claim 2, for ""a progestin,"" read a progestin Column 18, l ine 25', claim 5, for "claim 11" read claim 4 Signed and sealed this 22nd day of August 1972.

(SEAL) Attest:

ROBERT GOTTSCHALK EDWARD I T.FLETCHER.JR.

Attesting Officer Commissioner of Patents FORM PO-105O (10-69) uscoMM-oc 60376-P69 fi' U.S. GOVERNMENT PRINTING OFFICE: I969 0-366-334 

